1/*-
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Christos Zoulas of Cornell University.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	$NetBSD: sig.c,v 1.15 2009/02/19 15:20:22 christos Exp $
33 */
34
35#if !defined(lint) && !defined(SCCSID)
36static char sccsid[] = "@(#)sig.c	8.1 (Berkeley) 6/4/93";
37#endif /* not lint && not SCCSID */
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD$");
40
41/*
42 * sig.c: Signal handling stuff.
43 *	  our policy is to trap all signals, set a good state
44 *	  and pass the ball to our caller.
45 */
46#include "sys.h"
47#include "el.h"
48#include <stdlib.h>
49
50private EditLine *sel = NULL;
51
52private const int sighdl[] = {
53#define	_DO(a)	(a),
54	ALLSIGS
55#undef	_DO
56	- 1
57};
58
59private void sig_handler(int);
60
61/* sig_handler():
62 *	This is the handler called for all signals
63 *	XXX: we cannot pass any data so we just store the old editline
64 *	state in a private variable
65 */
66private void
67sig_handler(int signo)
68{
69	int i;
70	sigset_t nset, oset;
71
72	(void) sigemptyset(&nset);
73	(void) sigaddset(&nset, signo);
74	(void) sigprocmask(SIG_BLOCK, &nset, &oset);
75
76	sel->el_signal->sig_no = signo;
77
78	switch (signo) {
79	case SIGCONT:
80		tty_rawmode(sel);
81		if (ed_redisplay(sel, 0) == CC_REFRESH)
82			re_refresh(sel);
83		term__flush(sel);
84		break;
85
86	case SIGWINCH:
87		el_resize(sel);
88		break;
89
90	default:
91		tty_cookedmode(sel);
92		break;
93	}
94
95	for (i = 0; sighdl[i] != -1; i++)
96		if (signo == sighdl[i])
97			break;
98
99	(void) sigaction(signo, &sel->el_signal->sig_action[i], NULL);
100	sel->el_signal->sig_action[i].sa_handler = SIG_ERR;
101	sel->el_signal->sig_action[i].sa_flags = 0;
102	sigemptyset(&sel->el_signal->sig_action[i].sa_mask);
103	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
104	(void) kill(0, signo);
105}
106
107
108/* sig_init():
109 *	Initialize all signal stuff
110 */
111protected int
112sig_init(EditLine *el)
113{
114	size_t i;
115	sigset_t *nset, oset;
116
117	el->el_signal = el_malloc(sizeof(*el->el_signal));
118	if (el->el_signal == NULL)
119		return -1;
120
121	nset = &el->el_signal->sig_set;
122	(void) sigemptyset(nset);
123#define	_DO(a) (void) sigaddset(nset, a);
124	ALLSIGS
125#undef	_DO
126	(void) sigprocmask(SIG_BLOCK, nset, &oset);
127
128	for (i = 0; sighdl[i] != -1; i++) {
129		el->el_signal->sig_action[i].sa_handler = SIG_ERR;
130		el->el_signal->sig_action[i].sa_flags = 0;
131		sigemptyset(&el->el_signal->sig_action[i].sa_mask);
132	}
133
134	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
135
136	return 0;
137}
138
139
140/* sig_end():
141 *	Clear all signal stuff
142 */
143protected void
144sig_end(EditLine *el)
145{
146
147	el_free((ptr_t) el->el_signal);
148	el->el_signal = NULL;
149}
150
151
152/* sig_set():
153 *	set all the signal handlers
154 */
155protected void
156sig_set(EditLine *el)
157{
158	size_t i;
159	sigset_t oset;
160	struct sigaction osa, nsa;
161
162	nsa.sa_handler = sig_handler;
163	nsa.sa_flags = 0;
164	sigemptyset(&nsa.sa_mask);
165
166	(void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset);
167
168	for (i = 0; sighdl[i] != -1; i++) {
169		/* This could happen if we get interrupted */
170		if (sigaction(sighdl[i], &nsa, &osa) != -1 &&
171		    osa.sa_handler != sig_handler)
172			el->el_signal->sig_action[i] = osa;
173	}
174	sel = el;
175	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
176}
177
178
179/* sig_clr():
180 *	clear all the signal handlers
181 */
182protected void
183sig_clr(EditLine *el)
184{
185	size_t i;
186	sigset_t oset;
187
188	(void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset);
189
190	for (i = 0; sighdl[i] != -1; i++)
191		if (el->el_signal->sig_action[i].sa_handler != SIG_ERR)
192			(void)sigaction(sighdl[i],
193			    &el->el_signal->sig_action[i], NULL);
194
195	sel = NULL;		/* we are going to die if the handler is
196				 * called */
197	(void)sigprocmask(SIG_SETMASK, &oset, NULL);
198}
199